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The average age for all De Anza Students for fall of 2017 is assumed to be...

The average age for all De Anza Students for fall of 2017 is assumed to be normally distributed with a mean of 28.7. The population standard deviation has been pretty consistent at 15. Twenty-five spring 2018 students were randomly selected. The average age for the sample was 26.4. Construct a 95% Confidence Interval for the true average of spring 2018 Evergreen Velley College students.

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